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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/perf/util/dsos.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/perf/util/dsos.c')
-rw-r--r-- | tools/perf/util/dsos.c | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/tools/perf/util/dsos.c b/tools/perf/util/dsos.c new file mode 100644 index 000000000..2db91121b --- /dev/null +++ b/tools/perf/util/dsos.c @@ -0,0 +1,321 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "debug.h" +#include "dsos.h" +#include "dso.h" +#include "vdso.h" +#include "namespaces.h" +#include <libgen.h> +#include <stdlib.h> +#include <string.h> +#include <symbol.h> // filename__read_build_id + +static int __dso_id__cmp(struct dso_id *a, struct dso_id *b) +{ + if (a->maj > b->maj) return -1; + if (a->maj < b->maj) return 1; + + if (a->min > b->min) return -1; + if (a->min < b->min) return 1; + + if (a->ino > b->ino) return -1; + if (a->ino < b->ino) return 1; + + /* + * Synthesized MMAP events have zero ino_generation, avoid comparing + * them with MMAP events with actual ino_generation. + * + * I found it harmful because the mismatch resulted in a new + * dso that did not have a build ID whereas the original dso did have a + * build ID. The build ID was essential because the object was not found + * otherwise. - Adrian + */ + if (a->ino_generation && b->ino_generation) { + if (a->ino_generation > b->ino_generation) return -1; + if (a->ino_generation < b->ino_generation) return 1; + } + + return 0; +} + +static bool dso_id__empty(struct dso_id *id) +{ + if (!id) + return true; + + return !id->maj && !id->min && !id->ino && !id->ino_generation; +} + +static void dso__inject_id(struct dso *dso, struct dso_id *id) +{ + dso->id.maj = id->maj; + dso->id.min = id->min; + dso->id.ino = id->ino; + dso->id.ino_generation = id->ino_generation; +} + +static int dso_id__cmp(struct dso_id *a, struct dso_id *b) +{ + /* + * The second is always dso->id, so zeroes if not set, assume passing + * NULL for a means a zeroed id + */ + if (dso_id__empty(a) || dso_id__empty(b)) + return 0; + + return __dso_id__cmp(a, b); +} + +int dso__cmp_id(struct dso *a, struct dso *b) +{ + return __dso_id__cmp(&a->id, &b->id); +} + +bool __dsos__read_build_ids(struct list_head *head, bool with_hits) +{ + bool have_build_id = false; + struct dso *pos; + struct nscookie nsc; + + list_for_each_entry(pos, head, node) { + if (with_hits && !pos->hit && !dso__is_vdso(pos)) + continue; + if (pos->has_build_id) { + have_build_id = true; + continue; + } + nsinfo__mountns_enter(pos->nsinfo, &nsc); + if (filename__read_build_id(pos->long_name, &pos->bid) > 0) { + have_build_id = true; + pos->has_build_id = true; + } + nsinfo__mountns_exit(&nsc); + } + + return have_build_id; +} + +static int __dso__cmp_long_name(const char *long_name, struct dso_id *id, struct dso *b) +{ + int rc = strcmp(long_name, b->long_name); + return rc ?: dso_id__cmp(id, &b->id); +} + +static int __dso__cmp_short_name(const char *short_name, struct dso_id *id, struct dso *b) +{ + int rc = strcmp(short_name, b->short_name); + return rc ?: dso_id__cmp(id, &b->id); +} + +static int dso__cmp_short_name(struct dso *a, struct dso *b) +{ + return __dso__cmp_short_name(a->short_name, &a->id, b); +} + +/* + * Find a matching entry and/or link current entry to RB tree. + * Either one of the dso or name parameter must be non-NULL or the + * function will not work. + */ +struct dso *__dsos__findnew_link_by_longname_id(struct rb_root *root, struct dso *dso, + const char *name, struct dso_id *id) +{ + struct rb_node **p = &root->rb_node; + struct rb_node *parent = NULL; + + if (!name) + name = dso->long_name; + /* + * Find node with the matching name + */ + while (*p) { + struct dso *this = rb_entry(*p, struct dso, rb_node); + int rc = __dso__cmp_long_name(name, id, this); + + parent = *p; + if (rc == 0) { + /* + * In case the new DSO is a duplicate of an existing + * one, print a one-time warning & put the new entry + * at the end of the list of duplicates. + */ + if (!dso || (dso == this)) + return this; /* Find matching dso */ + /* + * The core kernel DSOs may have duplicated long name. + * In this case, the short name should be different. + * Comparing the short names to differentiate the DSOs. + */ + rc = dso__cmp_short_name(dso, this); + if (rc == 0) { + pr_err("Duplicated dso name: %s\n", name); + return NULL; + } + } + if (rc < 0) + p = &parent->rb_left; + else + p = &parent->rb_right; + } + if (dso) { + /* Add new node and rebalance tree */ + rb_link_node(&dso->rb_node, parent, p); + rb_insert_color(&dso->rb_node, root); + dso->root = root; + } + return NULL; +} + +void __dsos__add(struct dsos *dsos, struct dso *dso) +{ + list_add_tail(&dso->node, &dsos->head); + __dsos__findnew_link_by_longname_id(&dsos->root, dso, NULL, &dso->id); + /* + * It is now in the linked list, grab a reference, then garbage collect + * this when needing memory, by looking at LRU dso instances in the + * list with atomic_read(&dso->refcnt) == 1, i.e. no references + * anywhere besides the one for the list, do, under a lock for the + * list: remove it from the list, then a dso__put(), that probably will + * be the last and will then call dso__delete(), end of life. + * + * That, or at the end of the 'struct machine' lifetime, when all + * 'struct dso' instances will be removed from the list, in + * dsos__exit(), if they have no other reference from some other data + * structure. + * + * E.g.: after processing a 'perf.data' file and storing references + * to objects instantiated while processing events, we will have + * references to the 'thread', 'map', 'dso' structs all from 'struct + * hist_entry' instances, but we may not need anything not referenced, + * so we might as well call machines__exit()/machines__delete() and + * garbage collect it. + */ + dso__get(dso); +} + +void dsos__add(struct dsos *dsos, struct dso *dso) +{ + down_write(&dsos->lock); + __dsos__add(dsos, dso); + up_write(&dsos->lock); +} + +static struct dso *__dsos__findnew_by_longname_id(struct rb_root *root, const char *name, struct dso_id *id) +{ + return __dsos__findnew_link_by_longname_id(root, NULL, name, id); +} + +static struct dso *__dsos__find_id(struct dsos *dsos, const char *name, struct dso_id *id, bool cmp_short) +{ + struct dso *pos; + + if (cmp_short) { + list_for_each_entry(pos, &dsos->head, node) + if (__dso__cmp_short_name(name, id, pos) == 0) + return pos; + return NULL; + } + return __dsos__findnew_by_longname_id(&dsos->root, name, id); +} + +struct dso *__dsos__find(struct dsos *dsos, const char *name, bool cmp_short) +{ + return __dsos__find_id(dsos, name, NULL, cmp_short); +} + +static void dso__set_basename(struct dso *dso) +{ + char *base, *lname; + int tid; + + if (sscanf(dso->long_name, "/tmp/perf-%d.map", &tid) == 1) { + if (asprintf(&base, "[JIT] tid %d", tid) < 0) + return; + } else { + /* + * basename() may modify path buffer, so we must pass + * a copy. + */ + lname = strdup(dso->long_name); + if (!lname) + return; + + /* + * basename() may return a pointer to internal + * storage which is reused in subsequent calls + * so copy the result. + */ + base = strdup(basename(lname)); + + free(lname); + + if (!base) + return; + } + dso__set_short_name(dso, base, true); +} + +static struct dso *__dsos__addnew_id(struct dsos *dsos, const char *name, struct dso_id *id) +{ + struct dso *dso = dso__new_id(name, id); + + if (dso != NULL) { + __dsos__add(dsos, dso); + dso__set_basename(dso); + /* Put dso here because __dsos_add already got it */ + dso__put(dso); + } + return dso; +} + +struct dso *__dsos__addnew(struct dsos *dsos, const char *name) +{ + return __dsos__addnew_id(dsos, name, NULL); +} + +static struct dso *__dsos__findnew_id(struct dsos *dsos, const char *name, struct dso_id *id) +{ + struct dso *dso = __dsos__find_id(dsos, name, id, false); + + if (dso && dso_id__empty(&dso->id) && !dso_id__empty(id)) + dso__inject_id(dso, id); + + return dso ? dso : __dsos__addnew_id(dsos, name, id); +} + +struct dso *dsos__findnew_id(struct dsos *dsos, const char *name, struct dso_id *id) +{ + struct dso *dso; + down_write(&dsos->lock); + dso = dso__get(__dsos__findnew_id(dsos, name, id)); + up_write(&dsos->lock); + return dso; +} + +size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp, + bool (skip)(struct dso *dso, int parm), int parm) +{ + struct dso *pos; + size_t ret = 0; + + list_for_each_entry(pos, head, node) { + char sbuild_id[SBUILD_ID_SIZE]; + + if (skip && skip(pos, parm)) + continue; + build_id__sprintf(&pos->bid, sbuild_id); + ret += fprintf(fp, "%-40s %s\n", sbuild_id, pos->long_name); + } + return ret; +} + +size_t __dsos__fprintf(struct list_head *head, FILE *fp) +{ + struct dso *pos; + size_t ret = 0; + + list_for_each_entry(pos, head, node) { + ret += dso__fprintf(pos, fp); + } + + return ret; +} |